# checks websites for newer versions using an (optional) regular expression defined in the manifest
# use $dir to specify a manifest directory to check from, otherwise ./bucket is used
param($app, $dir)

. "$psscriptroot\..\lib\core.ps1"
. "$psscriptroot\..\lib\manifest.ps1"
. "$psscriptroot\..\lib\config.ps1"

if(!$dir) { $dir = "$psscriptroot\..\bucket" }
$dir = resolve-path $dir

$search = "*"
if($app) { $search = $app }

# get apps to check
$queue = @()
gci $dir "$search.json" | % {
	$json = parse_json "$dir\$_"
	if($json.checkver) {
		$queue += ,@($_, $json)
	}
}

# clear any existing events
get-event | % {
	remove-event $_.sourceidentifier
}

# start all downloads
$queue | % {
	$wc = new-object net.webclient
	register-objectevent $wc downloadstringcompleted -ea stop | out-null

	$name, $json = $_

	$url = $json.checkver.url
	if(!$url) { $url = $json.homepage }

	$state = new-object psobject @{
		app = (strip_ext $name);
		url = $url;
		json = $json;
	}

	$wc.downloadstringasync($url, $state)
}

# wait for all to complete
$in_progress = $queue.length
while($in_progress -gt 0) {
	$ev = wait-event
	remove-event $ev.sourceidentifier
	$in_progress--

	$state = $ev.sourceeventargs.userstate
	$app = $state.app
	$json = $state.json
	$url = $state.url
	$expected_ver = $json.version

	$err = $ev.sourceeventargs.error
	$page = $ev.sourceeventargs.result

	$regexp = $json.checkver.re
	if(!$regexp) { $regexp = $json.checkver }

	$regexp = "(?s)$regexp"
	
	write-host "$app`: " -nonewline

	if($err) {
		write-host "ERROR: $err" -f darkyellow
	} else {
		if($page -match $regexp) {
			$ver = $matches[1]
			if($ver -eq $expected_ver) {
				write-host "$ver" -f darkgreen
			} else {
				write-host "$ver" -f darkred -nonewline
				write-host " (scoop version is $expected_ver)"
			}
			
		} else {
			write-host "couldn't match '$regexp' in $url" -f darkred
		}
	}
}

<#
write-host "checking $(strip_ext (fname $_))..." -nonewline
$expected_ver = $json.version

$url = $json.checkver.url
if(!$url) { $url = $json.homepage }

$regexp = $json.checkver.re
if(!$regexp) { $regexp = $json.checkver }

$page = $wc.downloadstring($url)

if($page -match $regexp) {
	$ver = $matches[1]
	if($ver -eq $expected_ver) {
		write-host "$ver" -f darkgreen
	} else {
		write-host "$ver" -f darkred -nonewline
		write-host " (scoop version is $expected_ver)"
	}
	
} else {
	write-host "couldn't match '$regexp' in $url" -f darkred
}
#>